What are components of domestic sewage and industrial Effluents ?

Explanation

Sewage from our homes as well as from hospitals are likely to contain many undesirable pathogenic microorganisms, and its disposal into a water without proper treatment may cause outbreak of serious diseases, such as, dysentery, typhoid, jaundice, cholera, etc.
Ulike domestic sewage, waste water from industries like petroleum, paper manufacturing. metal extraction and processing, chemical manufacturing, etc., often contain toxic substances, notably, heavy metals (defined as elements with density `gt5 g//cm^(2)` such as mercury, cadmium, copper, lead, etc.) and a variety of organic compounds.